Nonaqueous-electrolyte secondary battery

Abstract

Providing a nonaqueous-electrolyte secondary battery exhibiting superior rate characteristic and cyclability even under high-voltage application environments. The nonaqueous-electrolyte secondary battery includes: a positive-electrode current collector for nonaqueous-electrolyte secondary battery including: a current-collector body; and a film formed on a surface of the current-collector body, and composed of SnO 2 , a conductive carbon material and a binder for film; and a nonaqueous electrolyte containing LiPF 6 (i.e., lithium hexafluorophosphate) as an electrolytic salt.

1 . A nonaqueous-electrolyte secondary battery comprising:
 a positive-electrode current collector for nonaqueous-electrolyte secondary battery, the positive-electrode current collector including: a current-collector body; and a film formed on a surface of the current-collector body, and composed of SnO 2 , a conductive carbon material and a binder for film; and   a nonaqueous electrolyte containing LiPF 6  (i.e., lithium hexafluorophosphate) as an electrolytic salt.   
     
     
         2 . The nonaqueous-electrolyte secondary battery as set forth in  claim 1 , wherein a mixed ratio between said SnO 2  and said conductive carbon material is from 75:25 to 25:75 by mass. 
     
     
         3 . The nonaqueous-electrolyte secondary battery as set forth in  claim 1  further comprising a positive-electrode active material including a composite metallic oxide expressed by a general formula: LiCo p Ni q Mn r D s O 2  (where “D” is a doped component, and is at least one member selected from the group consisting of Al, Mg, Ti, Sn, Zn, W, Zr, Mo, Fe, and Na; “p”+“q”+“r”+“s”=1; 0≦“p”≦1; 0≦“q”≦1; 0≦“r”≦1; and 0≦“s”<1). 
     
     
         4 . The nonaqueous-electrolyte secondary battery as set forth in  claim 1 , wherein a thickness of said film is from 100 nm to 1 μm.